An active ingredient declared at five per cent being present at one per cent is a difference nobody can detect by opening the jar. The texture is the same, the smell is the same, the feel on the skin is the same.
That is why the most common form of adulteration in cosmetics is not substituting the product but lowering the ratio. The cheap base stays; the expensive component is reduced. The declaration does not change.
What sensory checks catch
Sensory control catches spoilage, separation and crude substitutions. Those matter, but they do not reveal a difference in ratio. A quality team opening the product will give the same answer every time: "looks normal".
The gap between declaration and product is not a question of appearance but a question of measurement.
What measurement compares
The product’s own composition is measured and compared against a reference known to be correct. The reference comes from two places: profiles known across the sector, and the organisation’s own verified samples. The second accumulates over time and makes the measurement specific to that product.
The result is not a pass/fail stamp. Which component deviates from the expected, and by how much, is visible — and that determines what the conversation with the supplier is about.
When to measure
- On a new supplier’s first batch — to establish a reference.
- When the price drops unexpectedly — this is the most frequent warning sign.
- When a complaint arrives — to tie the claim to the product.
- Through periodic sampling — to track a supplier’s consistency.
Where the eye is fooled
A visual check on a cosmetic product inspects the packaging, not the contents. If colour, scent and texture fall in the expected range, the product passes. Yet the proportion of the declared active ingredient bears no relation to how flawless the packaging is; adulteration usually hides behind exactly that lack of relation.
The second source of error is habit. An eye that has seen the same product hundreds of times is expected to catch small deviations, but in practice the opposite happens: the eye sees what it expects, and the deviation becomes normal.
The distance between claim and measurement
The content declaration on a label is a commitment; measurement is what that commitment is worth. The distance between the two is not always zero, and it does not have to be — seasonal movement in natural raw material is normal. What matters is that the distance is known and tied to a threshold.
Where no threshold is written down, every deviation is open to argument. Where one is, the argument stays technical: is the measurement inside the threshold or not.
When to measure
The most expensive time to measure is after the product reaches the shelf. The cheapest is at raw-material intake. Cost rises at every step in between, because by the time the problem is found there is more work to undo. A measurement at intake costs far less than one after filling.
The packaging may be flawless; flawless packaging says nothing about what is inside.